I'm looking for information on the maximum recommended JVM settings you set for job servers on an Windows Server 2008 64-Bit? The server is currently running two job servers at 1.5gb each and I wanted to increase these settings without locking anything up once we migrate over to 8.X

Troubleshooting memory problems is arduous... If at all possible, spec out twice as much memory as you think you'll ever need. I would opt for the densest DIMMs that the server will support. (Of course you'll probably want to populate entire system board, to take advantage of Nehalem's triple channel memory, assuming that you're on an Intel platform.)